Return-Path: Received: from mtain-mj08.r1000.mx.aol.com (mtain-mj08.r1000.mail.aol.com [172.21.164.92]) by air-me06.mail.aol.com (v129.4) with ESMTP id MAILINME062-8bb54d2b2983134; Mon, 10 Jan 2011 10:45:07 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 820C9380000A3; Mon, 10 Jan 2011 10:45:01 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PcJui-0003n0-Pt for rs_out_1@blacksheep.org; Mon, 10 Jan 2011 15:44:08 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PcJui-0003mr-80 for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 15:44:08 +0000 Received: from smtp-out21.han.skanova.net ([195.67.226.208]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PcJug-0000vg-H7 for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 15:44:08 +0000 Received: from [127.0.0.1] (62.20.250.30) by smtp-out21.han.skanova.net (8.5.133) (authenticated as u33233109) id 4D075171007F5361 for rsgb_lf_group@blacksheep.org; Mon, 10 Jan 2011 16:44:00 +0100 Message-ID: <4D2B293F.80608@telia.com> Date: Mon, 10 Jan 2011 16:43:59 +0100 From: "Johan H. Bodin" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; sv-SE; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <004701cbb0d8$25d56e40$0401a8c0@xphd97xgq27nyf> In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: Capacitor warning and First 500kHz Class E breadboard Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-sid: 3039400c89b04d2b297d6949 X-AOL-IP: 195.171.43.25 X-Mailer: Unknown (No Version) Andy, the last two pages of http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps.pdf is a nice and simple guide to the "two dimensional" tuning of the class E amplifier. The trick is to get Vdrain make a soft landing on the right spot of the GND runway :-) By the way, adjusting L may be easier than adjusting C2, it has the same effect. 73 Johan SM6LKM ---- Andy Talbot wrote 2011-01-10 16:18: > Well, the first breadboard with only vaguely correct values worked OK - so it > doesn't look too be all that critical. Design Q of teh tank circuit is 5, so > values won't be that important. No need to tap the L measure and get it right > to start with,then use parallel C to fine tune the finished amp. With this > sort of Q. "narrow band" for class E probably means > 10kHz